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Graphical comparison: Unicast vs. Multicast
The effect that unicast transmission has on network resources is accumulative consumption.
Each user who connects to a multimedia transmission consumes as many kilobits per second
as the content encoding will permit.
B3. RTP protocol.
RTP are the initials of Real-time Transport Protocol. It is a transport level protocol used for the
transmission of information in real time, as occurs with audio and video. Normally it is paired
with RTCP (RTP Control Protocol) and is located on UDP.
The IP ports defined for its use are 5004 (RTP) and 5005 (RTCP) for PROG and 5008/5009
for COORD.
The functions of the RTP/RTCP protocol are:
•
Management of the reception buffer in order to minimize the jitter effect introduced by
the network.
•
Recovery of the reference clock based on information inserted by the transmitting
equipment.
•
Test tools to permit the user to verify the bandwidth, the delay and estimated jitter in the
connection.
RTP Header
For complete information on RTP/RTCP protocol, we recommend consulting:
http://tools.ietf.org/html/rfc1889
http://tools.ietf.org/html/rfc1890
http://tools.ietf.org/html/rfc3550
http://tools.ietf.org/html/rfc3551
http://tools.ietf.org/html/rfc3711